production server issue

[armornet]

Hello,
when i use

npm start

the default runs at http://localhost:9966/

i can change the host and port number by the below command
budo index.js:bundle.js --host --port

but when i close the command line window the live site stops working..

how to use npm start or budo at production usage so that the site remains accessible even if i close the command line window